Charles and Jon talk to Joel Sartore, founder of NatGeo's Photo Ark project and one of the world's most preeminent wildlife photographers. Joel describes his passion for conservation, a passion inspired by parents who cared and a childhood spent in nature. He outlines his career, which took him from a cub photographer with the Wichita Eagle, to National Geographic where he now runs the Photo Ark and has photographed more than 18,000 species in human care. Joel explains his photogr...